EXHIBIT 10.19

                              MCKESSON CORPORATION

                               STOCK PURCHASE PLAN

                 (As amended and restated through July 31, 2002)



      1. ESTABLISHMENT. There is hereby adopted the McKesson Corporation Stock
Purchase Plan (hereinafter called the "Plan"), subject to approval by holders of
at least a majority of the outstanding shares of voting stock of the
Corporation.

      2. STOCK SUBJECT TO THE PLAN. Rights may be granted under the Plan from
time to time to key employees of the Corporation and its Subsidiaries to
purchase from the Corporation an aggregate of not more than 2,500,000 shares of
Common Stock ($.01 par value) of the Corporation.

      3. ADMINISTRATION OF THE PLAN. The Plan shall be administered by a
committee (the "Committee") consisting of not less than two directors of the
Corporation to be appointed by the Board, each of whom is a "non-employee
director" within the meaning of Rule 16b-3 under the Securities Exchange Act of
1934. No member of the Committee shall be eligible to receive benefits under the
Plan. The Committee may from time to time determine which eligible employees
shall be granted rights under the Plan, and the number of shares for which a
right shall be granted to the employee. The Committee shall have the sole
authority, in its absolute discretion, to adopt, amend, and rescind such rules
and regulations as, in its opinion, may be advisable in the administration of
the Plan, to construe and interpret the Plan, the rules and regulations, and to
make all other determinations deemed necessary or advisable for the
administration of the Plan. All decisions, determinations and interpretations of
the Committee shall be final and binding on all grantees and purchasers of stock
under the Plan and on other interested parties.

      4. ELIGIBILITY. Persons eligible for rights under the Plan are those key
employees of the Corporation or its Subsidiaries designated from time to time by
the Committee. Members of the Board of Directors of the Corporation who are not
employed as regular salaried officers or employees of the Corporation or of any
Subsidiary of the Corporation may not participate in the Plan.

      5. EXERCISE PRICE. The exercise price of the stock covered by each right
shall not be less than fair market value of such stock on the date the right is
exercised, which shall be the closing sale price on such day on the New York
Stock Exchange.

      6. RIGHT TERMS AND CONDITIONS; EXTENSION OF CREDIT BY THE CORPORATION. The
term of each right shall be for such period not in excess of thirty days as the
Committee may determine. Purchases shall be evidenced by a written Stock
Purchase Agreement which may provide for the payment of the purchase price (i)
by a payment in cash or (ii) entirely by a




promissory note payable on such repayment schedule as the Committee may
determine or (iii) by any combination of (i) and (ii). The Stock Purchase
Agreement may contain such other terms, provisions, and conditions as are
determined by the Committee. Stock purchased by an employee under the Plan shall
be pledged to the Corporation as collateral for the purchase loan terms and
conditions set forth in the Stock Purchase Agreement.

      7. VOTING, DIVIDEND RIGHTS, ETC. Shares purchased by employees under the
plan shall be fully paid and non-assessable and be entitled to voting, dividend
and other rights.

      8. AMENDMENT, SUSPENSION OR TERMINATION OF THE PLAN. The Board of
Directors may at any time suspend or terminate this Plan, and may amend it from
time to time in such respects as it may deem advisable.